Steam-trap.



FRANCIS DUFFY, OF KINGSTON, ONTARIO, CANADA.

STEAM-TRAP.'

Specification of Letters Patent.

Application filed July 27, 1907.

Patented April 14, 1908.

serial No. 385,904..

To all whom it may concern:

Be it known that I, FRANCIS DUFFY, a subject of the King of Great Britain, residing at Kingston, in the county of Frontenac, Province of Ontario, Canada, have invented certain new and useful Improvements in Steam- Traps; and I do hereby declare that the followlng is a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to steam traps.

The object of my invention is to provide a trap of simple construction and of few parts, and, particularly, one which will utilize the forces of expansion and contraction of a coil of pipe to regulate the feed of the water of condensation therefrom.

A further object is to provide a construction in which the operating elements are outside of the coil to which they are applied.

A further object is `to provide a construction which is connected by resilient means so as to compensate for any over pressure in the coils to which the invention is applied.

My invention consists of the construction, combination, and arrangement of parts, as herein illustrated, described, and claimed.

In the accompanying drawings forming part of this application, I have illustrated one form of embodiment of my invention, in which drawings similar reference characters designate corresponding parts, and in which:

Flgure 1 is a side elevation; Fig. 2 is a plan of an elbow: and, Fig. 3 is a plan of a yoke, partly in horizontal section.

Referring to the drawi s, 1 designates the inlet pipe to the trap, w lch pipe is connected to any common form of steam heated vcoil or radiator. The inlet pipe 1 is connected to an inclined pipe 2, which is in turn connected to a series of inclined pipes as by means of the U-shaped elbows 3 connecting said pipes in pairs at their adjacent ends. These U-shaped elbows 3 are each provided with a boss 4, for a purpose hereinafter described. The pi es 2 arey supported by a common form o pipe supporting standard. 5, and the bottom pipe 2 1s connected to a valve casing 6, from which valve casing leads the return pipe 7.

A link 8 is pivotally secured at 9 to the inlet end of the uppermost pipe 2 and has its o posite end secured as at 10 to one end of a ever 11. The lever 11 is pivoted to the adjacent boss 4 on the elbow 3, as by the having attached to its lower end a link 14.

Alink 15 is disposed within its end adjacent the link 14 and both links 14 and 15 are provided with notches 16. The adjacent ends of the links 14 and 15 are disposed within a sleeve 17 and maintained therein as by means of a helical spring 18, the ends of which spring engage in the notches 16, so that the links 14 and 15 are resiliently held together. One end. of the link 15 is secured between the ends of a yoke 19, the opposite end of which yoke is provided with a screwthreaded opening 20. A screwthreaded valve stem 21 is disposed through the opening 20 and bears on its end a valve 22 adapted to engage the valve seat 23 in the valve casingv, and thus to control the feed of the water of condensation through the casing. A spring 24 has one end secured to the lower end of the lever 13 and its opposite end secured to a iiXed support. The object of this spring is to overcome the pressure of the water in the coils when the same is cut off, so as to assist in opening the valve 22, so that this spring would normally maintain the valve o en.

pIn the operation of the invention the hot water from the coil to which the trap is attached would enter the inlet pipe .1 and fill the pipes 2, causing them to expand. EX- pansion of the ipes 2 would cause the lever 11 to be rocke as the link 8 is secured as at 9. This rocking movement of the lever 11 will finally be communicated to the lever 18, causing the movement of the links 14 and 15. This movement of the links 14 and 15 causes the yoke 19 to be carried towards the right hand looking at Fig. 1 and thereby causes the valve 22 to close on the seat 23. The body of water of condensation in the pipe 2 prevents the escape of live steam. As the water inthe pipes 2 cools, it causes contraction of the pipes and the consequent reverse movement to that described, causing the valve 22 to open and permit the passage of the water through the return ipe 7. When the steam in the coils to whic the trap is attached is cut off, the pressure of the Water in the pipe 2 is balanced by the spring 24 and the valve 22 thrown open. The spring 18 connecting the links 14 and 15 is adapted to compensate for the varying pressure of the water in the lio pipes 2l. If a certain pressure is exceeded, eXceedin the strength of the spring 18, the valvewil be permitted to open and the water will escape t rough the return pipe 7. The valve 22 may be adjusted by means of the screwthreaded stem 21, so that any desired feed of water may be arranged.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is:

l. A steam trap comprising a pipe coil, a valve controlling the outlet from the steam coil, resiliently connected means for openin` and closing the valve by the contraction an expansion of the pipes of the coil, and res sillent means for maintaining the valve open when steam is shut off from the coil.

2. A steam tra comprising a plurality of inclined pipes, e bows connecting the adjacent ends of the pipes provided with projecting bosses, levers pivoted on the bosses a link having one end Xed and its opposite end connected to one of the levers, a pluv rality of links connecting the other levers in series, an outlet valve in one of the pipes, and means for connecting the end of one of the levers with the valve to open and close the same.

3. A steam trap comprising a steam coil, a lever rojecting from the steam coil, means for roclging the lever by the expansion and contraction of the steam coil, a pair of resiliently connected links connected to the lever, a valve casing connected to the coil, a valve disposed in the casing, and a yoke arranged to actuatev the valve and having one end connected to one of said links.

4. A steam trap comprising a coil, an outlet valve for the coil, a screwthreaded valve stem on the valve, a yoke having a screwthreaded opening therein through which the stem is dis osed, a link carried by the yoke, a second lin: resiliently connected with said link, and means for moving the latter link by the contraction and expansion of the coil.

5. A steam trap comprising a coil, a lever ivoted to the coil, means for moving the ever, links resiliently connected together and connected with the lever, an outlet valve for the coil, means for moving the valve from the link, and a spring having one end secured to said leverand its opposite end secured to a fixed support.

6.' A steam trap comprising a coil, an outlet valve for the coil, a link connected with the valve, a second link adapted to be moved by the expansion and contraction of the coil, said links being provided with notches, a helical spring disposed around thevlinks and having its ends disposed in the notches, and a sleeve disposed within the helical s ring and around the adjacent ends of the inks.

7. In a steam trap having a valve, means for actuating the valve, connecting means comprising a pair of links having notches,

therein, a sleeve disposed around the ends of the links, and a helical spring disposed around the sleeve, and having its ends engaged in the notches in the links.

In witness whereof I have hereunto set my hand in the presence of two witnesses.

` FRANCIS DUFFY.

Witnesses: l

G. O. WARD, ALFRED LAKE. 

